Russell, 

Thanks for the driver circuit - very useful (and cheap
to build, I think around 0.20 USD).  

Questions that I didn't see explicitly answered in the
original notes - the top rail should be at least the
Vgs+.7 for the desired Rds, correct?  I assume that
the trigger input to Q6 can be +5.  right?

Phil


--- Russell McMahon <apptech@paradise.net.nz> wrote:

> > What would be the chip-of-choice to driver a bunch
> (4 or 8) 
> > N-Mosfets
> > from PIC output pins? The Mosfets are of course
> not 5V-types, they 
> > need
> >>10V at their gates.
> 
> If you don't mind a few glue parts consider multiple
> versions of the 
> driver cct I posted a day or two ago.
> 
> Key questions are,
> 
> - are these low side FETs (presumably)?
> - Switch how fast?
> - What supply voltage for FETs?
> - What load?
> - What power levels?
> 
> 'My' (time honoured) circuit will meet most needs
> well and cheaply.
> Parts count per channel - 2 x small NPN, 3 x R, 1 x
> Z, 1 x D,1 x cap 
> (optional).
> Very amenable to SMT implementation.
> 
> See recent post for notes.
> 
> I'll post it again - 'only' 3K.
> 
> 
>         Russell 
> > -- 
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